Hull Kingston Rovers chairman Neil Hudgell has hinted that the change of ownership at Hull FC can spark a spirit of co-operation between the two clubs.
"We've not maximised our collective powers as a city because we've been divided," said Hudgell, Rovers' chairman for the last seven years.
"Two clubs working together on issues of common interest can only be of benefit," he told BBC Radio Humberside.
Adam Pearson completed the takeover of Rovers' city rivals in July.
"Ultimately the only derby in the game is Hull KR and Hull FC," said Hudgell.
"The rivalry needs to remain at that top level on the field at a senior level and that's where it is for me, there's no divide on that and no bringing together on that.
"We want to beat them every time we play them. That's where the passion and the divide should be.
"But the historical importance and positioning of Hull as a rugby league city is to try and recreate a city-wide side that takes on an Australian touring side or the Australian Grand Final winners as a prelude to the World Club Challenge or even plays England in a mid-season international.
"I think that's a powerful statement of the strength of the collective of Hull rugby league."
Hudgell also points out that there would be off-the-field benefits to both clubs.
"Even small things like buses for games and medical supplies," he said. "If you're buying things in bulk across two sides it means you get things possibly a little bit cheaper, so there's an economic bargaining position there."